Migrate wormholescan to use new SDK

[SamantaCasal]

Description

Source: https://github.com/XLabs/wormscan-ui/issues/689 (Valentino Comment)

This document describes the code changes needed to be able to replace the old wormhole-sdk to the newest one

Steps needed to be done

There are two steps that need to be done for the app to be able to run with the new wormhole-sdk:

1. Upgrade from ethers@4 to ethers@6: ethers versions are incompatible between them, we can't have both installed, and wormhole-sdk depends on v6. Doing this includes:

• replacing every occurrence of a BigNumber to a native JS BigInt, for most cases it's straight-forward, but BigNumber had the from() function that we'll need to implement manually.
• replacing the imports of the ethers functions to their new location, and replacing those that don't exist anymore with a manual alternative
• adapt the code for the new ethers Types

2. Replace every common function from the old sdk to the new sdk: old sdk functions won't work anymore because of the ethers upgrade, so they'll need to be replaced before the app can run. This includes:

• replacing every ChainId in the app to the new ChainId type from the sdk
• replacing every ChainId.Avalanche or CHAIN_ID_AVALANCHE to chainToChainId('Avalanche')
• replacing every parseVaa() with the new deserialize() method
• implement a new method to get the "Signed Vaa" info (signed guardians and signatures)

[valentinoConti]

Ready to test in https://dev.wormholescan.io/

Everything should work the same except for Standard Relayer transaction which won't load, and operations without information from the API are not going to be get via RPCs; that should work after #734 gets completed

[SamantaCasal]

Most of the transactions tested are OK.

Please review the cases that I mention in the Notes sheet. https://docs.google.com/spreadsheets/d/10otoe2GT5dbeMui4_uWuPGhtX2__d5eY-UONjuqq-a4/edit?usp=sharing